In an address at Georgetown Law School, Conway, who is an attorney, warned that Trump's statements suggesting that top current and former Justice Department officials should be jailed for their role in the special counsel investigation were anti-democratic.

"The president has suggested that members of his own Justice Department should be locked up for investigating the president," Conway told an audience Friday.

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"Now, if people were to get indicted or not indicted on the basis of whether or not the president likes them, we wouldn't have a republic," he added. "We'd have a banana republic."

The attorney also warned earlier in the week that Trump could face impeachment if reports of his involvement in pressuring the Justice Department to block a merger of Time Warner and AT&T proved to be true.